/*
 * Copyright 2011 Mikhail Lopatkin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.bitbucket.mlopatkin.android.logviewer.search;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;


class RegExpSearcher implements HighlightStrategy, SearchStrategy {
    private Pattern pattern;

    public RegExpSearcher(String regex) throws PatternSyntaxException {
        pattern = Pattern.compile(regex);
    }

    @Override
    public boolean isStringMatched(String s) {
        return pattern.matcher(s).find();
    }

    @Override
    public void highlightOccurences(String text, TextHighlighter highlighter) {
        Matcher m = pattern.matcher(text);
        int pos = 0;
        while (m.find(pos)) {
            highlighter.highlightText(m.start(), m.end());
            pos = m.end();
        }
    }
}